Isolation of a 1 -Magnesium-2,3-disilacyclopropene and a Related Bis(disilenide)

摘要

Herein we report the first synthesis of a l-magnesium-2,3-disilacyclopropene and a related bis(disilenide). Reduction of (boryl)tribromosilane (1, boryl = (HCArN)_2B, Ar = 2,6-iPr_2C_6H_3) with magnesium in THF afforded boryl-substituted magnesium complex [(boryl)Si]_2Mg(THF)_3 (2) in good yield, whereas reduction of (boryl)trichlorosilane (3) with KC_8 in THF led to the isolation of bridged alkoxy alkyl bis(disilenide) (THF)K(boryl)Si=Si(boryl)O(CH_2)_4(boryl)Si=Si(boryl)K(THF) (4) via ring opening of a THF molecule. X-ray diffraction analysis of 2 confirmed the presence of the novel Si2Mg three-membered ring as well as the Si=Si double bond, which existed in a noticeably twisted B—Si—Si—B array. Complex 2 also represents the first reported example of a stable disilyne dianion.